Overeem last year tested positive for testosterone levels higher than those permitted by Nevada athletic regulators, forcing him out of a UFC 146 fight last spring against Junior dos Santos and, ultimately, a nine-month suspension from the commission.

The heavyweight Overeem, who appeared before the commission at the Grant Sawyer Building in downtown Las Vegas, told commissioners he learned from his mistakes. He passed random tests given by the commission in November and December.

“I came before you to show myself in person,” he said. “We’ve done everything we could to correct ourselves from the errors that were made. I’m ready to get my life back on track and get fighting.”

Overeem’s return will surely be one of the highlights of the UFC’s Super Bowl weekend card — one of the group’s top shows.

“Congratulations. Welcome back to Nevada,” said Bill Brady, the commission chairman.

Jay Hieron was also licensed by the commission to fight in UFC 156. The 36-year-old Hieron, and all fighters over the age of 35, are required to pass medical test as part of the license requirements. Hieron, a Las Vegas resident who also appeared, is slated to fight Tyron Woodley.

Demetrious "Mighty Mouse" Johnson slammed his hands down on his UFC flyweight championship belt. Somewhere else in Rogers Arena, Rory MacDonald surely looked on with envy. Johnson and MacDonald put on dominant performances in the UFC's first trip to Vancouver in three years. Johnson defended his title for the fourth time, not allowing Ali Bagautinov to win any of their five fast-paced rounds. That couldn't quite top MacDonald, who barely let Tyron Woodley touch him in an all-important welterweight co-main event. MacDonald hopes the performance leads him to an opportunity to claim space alongside Johnson in the UFC champion's club.